Anti-magic Shell/Zone

We buffed AMS because we dropped the mitigation of Icebound Fortitude and Bone Shield by a pretty hefty margin.

I believe we did adjust the AMS glyph, but I'm not in front of my desk at the moment.

One idea that has been circulating is to have AMS and AMZ share a cooldown so that the DK can't just pop both in rapid succession. It's possible this might make AMZ pretty unattractive in PvE though, which is why we haven't pulled the trigger on that one yet.